MI5 Intelligence Officer Liz Carlyle is summoned to a meeting with her boss Charles Wetherby, head of the Service's Counter-Espionage Branch. His counterpart over at MI6 has received alarming intelligence from a high-placed Syrian source. A Middle East peace conference is planned to take place at Gleneagles in Scotland and several heads of state will attend. The Syrians have learned that two individuals are mounting an operation to disrupt the peace conference in a way designed to be spectacular, laying the blame at Syria's door.